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Old 05-23-2003, 07:24 AM
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Post Idle Air Controller

My dad has a 1988 Olds Cutlass Ciera with a 2.8L. Where is the Idle Air Controller and how do I check the Idle Air Controller?
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Old 05-23-2003, 10:46 AM
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If it is fuel injevted. I dont think there is a idle screw. Usually if it is idling to fast. the base gasket is blown. Idle about 1600-1800 rpm
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Old 05-23-2003, 11:11 AM
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It is fuel injected. Where is the base gasket? Would it be hard to change it? The reason we were suspecting this is because it does not stay at a certain RPM at idle. It goes up and down alot. Even in gear it does it.

[ May 23, 2003: Message edited by: chevracing ]

[ May 23, 2003: Message edited by: chevracing ]</p>
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Old 05-23-2003, 11:40 AM
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if it is tbi. the base gasket is under the throttle body. take off the breather. and there should be three bolts that hold the throttle body. but, if it has an irratic idle it could be many things. throttle position sensor, mass airflow sensor, fuel filter, fuel pump, fuel pump relay, oxygen sensor. the list goes on and on. the best bet would be go to a parts store and ask if they can check the computer codes for you. If the computer has set a code. this is the best place to start. on a chevy it is a simple one wire jumper. and turn on the key. but, i do not remember the contacts to jump. most parts houses sell a jumper for chevys. and it comes with a computer code book that tells you all the possible codes. I hope this information helps you.
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Old 05-23-2003, 11:53 AM
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Getting back to the original question, the idle air control valve is located in the TB as is the throttle position sensor.
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Old 05-28-2003, 04:48 AM
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Is it hard to change? How expensive are they?
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Old 05-28-2003, 04:58 AM
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had a similar problem on a chevrolet cavalier, the idle air control valve just needed cleaning out as it had become gunked up with years of oil coming through a PCV hose (poor design, no baffle), tube needed replacing as well as that was fairly well blocked, get a haynes manual, that'll tell you where it is
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Old 05-28-2003, 05:03 AM
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The GM TPS is on the opposite side of the air valve as the throttle hookup and should be easy to remove/replace. Most are set with an OHM meter, but could be done by slowly rotating the TPS until the desired idle is reached. Slowly as in make minute movement and wait for the engine to stabalize before making another movement. Not near as good as setting with meter. The TPS is one of the less expensive sensor for EFI systems and it is the "usual suspect" for idle problems because of the continual operation when driving.

Trees

[ May 28, 2003: Message edited by: trees ]</p>
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Old 05-29-2003, 04:36 AM
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Would changing out the PCV valve help anything or should I just change the tube that runs off of it? Thanks for y'alls help!
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Old 05-29-2003, 05:43 AM
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Lubricate the tranny. :p
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